Hydraulic air-pump



" 2 Sheets-Sheet 1.

N. GURTN. HYDEAULIG AIR PUMP.

(No Model.)

Patented Aug. 23

( 0 Model.)

. 2 Sheets-Sheet 2. N. CURTIS,

HYDRAULIC AIR PUMP.

m U m v,. 3': a 2 mo u I v A t. {I n, n U 1 e Y M fin 0 8 0 6 4 2 0 N Wm m 1 Nurse STATES ATENT OFFICE.

NELSON CURTIS, OF NEWTON, MASSACHUSETTS.

HYDRAULIC AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. 246,089, dated August23, 1881. Application filed Marches, 1881. (No model.)

To all whom "it may concern Be it known that I, NELsoN OUR'rIs, ofthecity of Newton, in the county of Middlesex and State of Massachusetts,have invented certain new and useful Improvements in HydraulicAir-Pumps; and I do hereby declare that the following is a full andexact description thereof, reference being bad to the accompanyingdrawings, and to theletters of reference marked thereon, the sameforming part of this specification.

The nature of my invention relates to the construction, arrangement ofparts, and their combination, in the manner substantially as hereinaftermore fully described, to produce a compact and automatic machine, which,by means of the flow of water under pressure in a connected pipe, willbe available for forcing air or other fluid into a reservoir, and formaintaining a given pressure therein.

With reference to the drawings, like letters refer to the same orcorresponding parts in all the figures.

Figure 1 is a sectional elevation of the machine. Fig. 2 is an elevationof one half, the other half being symmetrical, of the machine viewed atright angles with the view of Fig. 1.

Fig. 3 is a plan, a part being broken out to' show parts below. Fig. 4is an enlarged sectional elevation of the upper part of the machinecorresponding to Fig. 1. Fig. 5 is a view of the air-valve and case aI). Fig. 6 is a plan of the check-valve seat and guide 0. Fig. 7 isavertical sectional View of same. Fig. Sis an under "iew of check-valved.

c is an inlet-orifice for the supply-pipe, where the water enters underpressure into the float and forcing-cylinderf g, and h is anoutletpassage. The float and pressure or-forcing chamberfg is made intheillustration here of a metal base, f, a glass cylinder, 9, and ametal dome or top, i. These are secured together by suitable connectionsor screw-rods, j, the joints being suitably packed, as at 7r.

A piston, l, with valve m attached, is arranged to operate in a cylinderor chamber, a, and communication by a small orifice is kept up betweenchamber a and the supply-pipe, which enters at 0. Chamber at has anoutlet closed by a valve, 0, delivering into chamber fg. The valve 0 isopened and closed by the attached lever 19, which receives its movementsfrom sleeve q. Sleeve q is guided by rod 4",

upon which it is freely fitted, with a slight frictional contactsufficient (or thereabout) to sustain its weight at any point to whichit may be moved. The frictionv may be obtained by slightly bending thesleeve or rod, or otherwise. The float s is fitted freely about thesleeve, and is free to travel up and down upon it between the limitsfixed by flanges t u.

The sleeve q embraces the end of lever between two flanges, t v, ortheir equivalents.

A pivoted lever, w, is actuatedby the valve on or piston l, andcommunicates to valve a: and a secondary or supplemental valve, 3 theirmovements, which are simultaneous with, but opposite to, the movementsof valve m. The secondary valve y opens first, and being small openseasily, relieving the pressure somewhat on the valve m, so that it mayopen easily.

Referring to the upper part of the drawings, 2 is a floating valve,which, in case the forcing water or liquid rises so far, will 'befloated up and close the passage A, which is the air-escape orexit-passage from chamberf g.

a is an inletting air-supply valve; and it consists of an annulardiaphragm or flap, closing against the blank seat B and opening inward.d is a wing, puppet, or suitable valve, closing the air-exit passagebeyond A whenever the pressure in this passage is great enough to pressthe diaphragm l) upward against the pressure of spring E, thuspreventing the foreing of any more air into chamber F and its outlet G.The outlet G is to be connected by pipe to any other pipe, reservoir, orreceiver where a given pressure is required to be maintained. Theapparatus will also work, irrespective of a given pressure beingrequired, up

to a certain limit of pressure proportionate to l the pressure of thewater that a'ctuates the machine.

The valve (1 is provided with wings H for convenience in theconstruction. The spring E is graduated to any given pressure by meansof the adjusting-screw L. The spring E acts on the diaphragm D throughthe piston M.

N is a check-valve, preventing the air from returning into thechamberfg.

The operation is substantially as follows: The water has nearly escapedthrough valves a: y. This allows floats to strike flange it, thus movingthe sleeveqdownward, depressin glever p and opening valve 0, whichrelieves pressure in chamber a. In consequence the pressure in pipe 0opens valve m, and at the same instant lever &0 allows valves 00 y toclose. The water then rises in the chamberfg, carrying upward the floats 8 until it strikes the flange a. Meanwhile therisin g water forces theair from chamber f 9 through passage A past valve N, through valve (1out into pipe Gr. Vhen the float strikes flange a it lifts sleeve q,lever 17, and closes valve 0, causing pressure to accumulate in chamberafrom pipe 0. This pressure acts on piston l and closes valve m,causingleverw simultaneously, or nearlyso, to open valves ya", when thewater flows out again, as before, from chamber f gthrough valves my,completing the process, which continues to re peat itself until thepressure in chamber under diaphragm D is suflicient to liftsaiddiaphragm, and thereby allow valve (1 to close, so limiting the increaseof pressure to the degree for which spring E has been adjusted. Duringthe escape of the water from chamber f g through valves ag the air-valvea B admits air to refill the chamberfg.

Instead of the pressure-regulating device 1) E L, &c., apressure-regulator may be applied to inlet-pipe e, and the ultimatepressure in pipe Gthereby controlled in some cases.

I claim- 1. The combination of the floats and sleeve q and its flangeswith the pivoted valve 0, lever 19, and piston l, substantially as andfor the purposes set forth.

2. Thelever w, in combination with the piston Z, valve or, and valve m,whereby is secured the simultaneous, or approximately simultaneous,inverse action of the valve .1: and valve m, substantially as described.

3. Thecombination ofthe valve 1 with valve 00, lever 10, and valve m,piston l, and valve 0, substantially as described.

4. The pivoted valve 0 and lever 12, in combination with the sleeve qand float s, substantially as and for the purpose set forth.

5. The chamber F, valve (1, diaphragm D, spring E, and adjustingscrewcap L, in combination with the pipes A and G, substantially asdescribed.

(3. The air-pump constructed as described, combining the base], cylinder9, dome i, inlet e,valve m, piston l, chamber n, communicating withinlet 0, lever w, valve 0, lever 12, valves :v y, float s, sleeve (1,guide 0', flanges a t, and outlet-passage A, check-valve N, andair-valve a, all substantially as described.

7. The lever 20, in combination with thepiston Z, valves 1 .r, and valvem, substantiallyas described.

NELSON O URTIS.

Witnesses D. N. B. COFFIN, ALFRED E. 00X.

